convention

Conventions are added meanings of bridgebids which convey information about the hand of the bidding player. These conventions allow players a rough idea of what cards other players have, and often allow a partnership to bid exactly the number of tricks they will take.

At cognitive science conventions, people give talks about cognition all day long and then mingle with one another at night to try to catch up with colleagues and network. I suspect that there is also a lot of trying to get laid going on, but it's all beneath the surface.

An extraordinary assembly of the parkiament or estates of the realm, held without the king's writ, -- as the assembly which restored Charles II. to the throne, and that which declared the throne to be abdicated by James II.

Our gratitude is due . . . to the Long Parliament, to the Convention, and to William of Orange.
Macaulay.

5.

An agreement or contract less formal than, or preliminary to, a traety; an informal compact, as between commanders of armies in respect to suspension of hostilities, or between states; also, a formal agreement between governments or sovereign powers; as, a postal convetion between two governments.

This convention, I think from my soul, is nothing but a stipulation for national ignominy; a truce without a suspension of hostilities.
Ld. Chatham.

The convention with the State of georgia has been ratified by their Legislature.
T. Jefferson.